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php字符串截取方法大全 php截取字符串四个例子

程序员文章站 2022-06-13 21:42:36
...
  1. //截取中文字符串
  2. function mysubstr($str, $start, $len) {
  3. $tmpstr = "";
  4. $strlen = $start + $len;
  5. for($i = 0; $i if(ord(substr($str, $i, 1)) --> 0xa0) {
  6. $tmpstr .= substr($str, $i, 2);
  7. $i++;
  8. } else
  9. $tmpstr .= substr($str, $i, 1);
  10. }
  11. return $tmpstr;
  12. }
  13. ?>
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2、截取utf8编码的多字节字符串

  1. //截取utf8字符串
  2. function utf8Substr($str, $from, $len) {
  3. return preg_replace('#^(?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'.$from.'}'. '((?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'.$len.'}).*#s', '$1',$str);
  4. } ?>
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3、UTF-8、GB2312都支持的汉字截取函数

  1. /*
  2. Utf-8、gb2312都支持的汉字截取函数 cut_str(字符串, 截取长度, 开始长度, 编码); 编码默认为 utf-8 开始长度默认为 0
  3. */
  4. function cut_str($string, $sublen, $start = 0, $code = 'UTF-8') {
  5. if($code == 'UTF-8') {
  6. $pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/";
  7. preg_match_all($pa, $string, $t_string);
  8. if(count($t_string[0]) - $start --> $sublen) return join('', array_slice($t_string[0], $start, $sublen))."...";
  9. return join('', array_slice($t_string[0], $start, $sublen));
  10. }
  11. else
  12. {
  13. $start = $start*2;
  14. $sublen = $sublen*2;
  15. $strlen = strlen($string);
  16. $tmpstr = '';
  17. for($i=0; $i=$start && $i129)
  18. {
  19. $tmpstr.= substr($string, $i, 2);
  20. }
  21. else
  22. {
  23. $tmpstr.= substr($string, $i, 1);
  24. }
  25. }
  26. if(ord(substr($string, $i, 1))>129) $i++;
  27. }
  28. if(strlen($tmpstr)
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4、BugFree 的字符截取函数

  1. /**
  2. * @package BugFree
  3. * @version $Id: FunctionsMain.inc.php,v 1.32 2005/09/24 11:38:37 wwccss Exp $
  4. *
  5. *
  6. * Return part of a string(Enhance the function substr())
  7. *
  8. * @author Chunsheng Wang
  9. * @param string $String the string to cut.
  10. * @param int $Length the length of returned string.
  11. * @param booble $Append whether append "...": false|true
  12. * @return string the cutted string.
  13. */
  14. function sysSubStr($String,$Length,$Append = false)
  15. {
  16. if (strlen($String) return $String;
  17. } else {
  18. $I = 0;
  19. while ($I $StringTMP = substr($String,$I,1);
  20. if ( ord($StringTMP) >=224 )
  21. {
  22. $StringTMP = substr($String,$I,3);
  23. $I = $I + 3;
  24. }
  25. elseif( ord($StringTMP) >=192 )
  26. {
  27. $StringTMP = substr($String,$I,2);
  28. $I = $I + 2;
  29. }
  30. else
  31. {
  32. $I = $I + 1;
  33. }
  34. $StringLast[] = $StringTMP;
  35. }
  36. $StringLast = implode("",$StringLast);
  37. if($Append)
  38. {
  39. $StringLast .= "...";
  40. }
  41. return $StringLast;
  42. }
  43. }
  44. $String = "CodeBit.cn -- 简单、精彩、通用";
  45. $Length = "18";
  46. $Append = false;
  47. echo sysSubStr($String,$Length,$Append);
  48. ?>
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